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《Chinese Journal of Geophysics》 2012-10
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2-D velocity images of upper crust in Tianshui area,Gansu Province

CAO Ling-Min1,LAI Xiao-Ling2 1 Marine Geology and Environment Key Laboratory,Institute of Oceanology,Chinese Academy of Sciences, Qingdao 266071,China 2 Geophysical Exploration Center,China Earthquake Administration,Zhengzhou 450002,China  
We used the Pg-wave arrival times from high-resolution active-source seismic sounding to carry out the tomographic job on the northeastern margin of Qinghai-Tibet plateau,that is,the Tianshui-Wudu area in West Qinling,with finite difference forward and least squares inversing algorithm with irregular meshes.The results indicate that the study area has rich and complex fractures,such as the fluctuant basement and the steep faults mostly extending to great depths and cutting through the basement.The low-velocity zone between Lixian and Xihe reflects the existence of Xi-Li sedimentary basin,the basement of which is about 5 km deep.The pronounced changing of the velocity contour on the east of Wushan is consistent with the fold region nearby.The Chengxian basin has a relatively high and gently changing velocity,the basement depth of which is less than 3 km.Near Lixian there is a near north-south fault,and a low-velocity zone exists beneath about 5 km depth in the tomographic profile,which may be the upwelling channel of the deep mantle substance in the Tibetan Plateau.
【Fund】: 国家自然科学基金青年科学基金项目(41204061);; 山东省博士后基金项目(Y12342104N)资助
【CateGory Index】: P315.2
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